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I did love the miracle

OK thanks for your kindness.
But with libraw_open_wfile

I get:

undefined reference to `libraw_open_wfile'

because in the LibRaw code there is

#if defined(_WIN32) && !defined(__MINGW32__) && defined(_MSC_VER) &&           \
    (_MSC_VER > 1310)
  int libraw_open_wfile(libraw_data_t *lr, const wchar_t *file)
  {
    if (!lr)
      return EINVAL;
    LibRaw *ip = (LibRaw *)lr->parent_class;
    return ip->open_file(file);
  }

So it can't work under msys2.